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Thanks. Your first suggestion of changing the display settings worked. Wonderful.

(I looked for another repository to get a later version of Qtractor from, but without success. When I installed the kxstudio .debs a few days ago, a strange situation occurred where some systemd services failed to run for no apparent reason - no error messages, just not running. When I uninstalled the ksstudio repositories, the systemd services worked again. Just to make sure, I reinstalled kxstudio repos, and the systemd services failed again. Uninstalled kxstudio again, and the systemd services worked again. So I'm not willing to go near kxstudio until I work out what was happening.)